The Nervous System II: Ion Channels
1. List four neurotransmitters that bind to ion channels, these neurotransmitters
are called ___________________________-acting neurotransmitters.
a.
b.
c.
d.
2. a. The binding of ACh opens ion channels in the dendrites or cell body that
permits both _______ and ____________ to move through them.
b. Which ion would move into the cell? ______________ out of the cell?
______________
c. Which ion has the greatest electrochemical gradient? ______________
d. The net movement of these two ions would do what to the cell?
_________________
e. This would be called an _____________________________
postsynaptic potential, or ____________________.
3. a. An inhibitory postsynaptic potential (IPSP) causes a neuron to
___________________.
b. An example of a neurotransmitter that causes an IPSP is ______________.
c. What type of ions move into the cell in response to this neurotransmitter?
______________.
4. a. Norepinephrine binds to a receptor that is separate from the ion channel.
This is known as a/an _____________________________
_ - acting
neurotransmitter.
b. Norepinephrine is known as the ___________________________ messenger.
c. The receptor is coupled to the ion channel by a ___________________.
5. a. This activates an enzyme which induces the production of a
_____________ messenger.
b. An intracellular enzyme is activated and ____________________ the ion channel.
c. As a result of this sequence of events, what channels are closed?
____________________
d. What does this do to the neuron? _____________________________
_
6. Name three neurotransmitters that can only act indirectly.
a.
b.
c.
7. Which of the four neurotransmitters mentioned in question 1 can also act indirectly?
a.
b.
c.
8. Which one of the four neurotransmitters mentioned in question 1 can
only act directly? ______________________
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